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Code Issues Releases Wiki Activity

Compiled filters are cached (#6402)

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* Compiled filters are cached

* Adjusting comments, and filtercache cap
This commit is contained in:
Cameron Fischer 2022-05-23 06:26:56 -04:00 committed by GitHub
parent c808764254
commit 696c5c9c7a
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1 changed files with 19 additions and 1 deletions
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20
core/modules/filters.js
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@ -220,10 +220,18 @@ source: an iterator function for the source tiddlers, called source(iterator), w
widget: an optional widget node for retrieving the current tiddler etc.
*/
exports.compileFilter = function(filterString) {
if(!this.filterCache) {
this.filterCache = Object.create(null);
this.filterCacheCount = 0;
}
if(this.filterCache[filterString] !== undefined) {
return this.filterCache[filterString];
}
var filterParseTree;
try {
filterParseTree = this.parseFilter(filterString);
} catch(e) {
// We do not cache this result, so it adjusts along with localization changes
return function(source,widget) {
return [$tw.language.getString("Error/Filter") + ": " + e];
};
@ -320,7 +328,7 @@ exports.compileFilter = function(filterString) {
})());
});
// Return a function that applies the operations to a source iterator of tiddler titles
return $tw.perf.measure("filter: " + filterString,function filterFunction(source,widget) {
var compiled = $tw.perf.measure("filter: " + filterString,function filterFunction(source,widget) {
if(!source) {
source = self.each;
} else if(typeof source === "object") { // Array or hashmap
@ -335,6 +343,16 @@ exports.compileFilter = function(filterString) {
});
return results.toArray();
});
if(this.filterCacheCount >= 2000) {
// To prevent memory leak, we maintain an upper limit for cache size.
// Reset if exceeded. This should give us 95% of the benefit
// that no cache limit would give us.
this.filterCache = Object.create(null);
this.filterCacheCount = 0;
}
this.filterCache[filterString] = compiled;
this.filterCacheCount++;
return compiled;
};
})();